[macastel1]

Hello:

Looking for some help. I want to upgrade the sound of my 2015 550ix by changing the axle back to a OEM M5 or M5 competition.

I am sure the answer is this forum but i cannot find it after hours of searching.

What are the differences between the 2 (m5 and 5 competition Package) axle back?

I found that the CP has black tips and it always has the valves open. But are they the same diameter? Any difference in installation? Or performance?

If the only difference is the valves being open (and therefore the more aggressive sound), can I just get the the regular M5 exhaust and wire the valves open or install a exhaustmeister to get the same results?

Please let me know, I am trying to buy the axle back exhaust from a member but I need to know the difference before pulling the trigger.

Thanks in advance!

(See you st bimmerfest east!)

[SLVSRFR]

Competition doesn't always have the valves open. The competition exhaust has the baffles removed inside the cans. The FULL competition exhaust doesn't have perforation in the resonators (resonator delete) and that's where the majority of the difference in sound comes from compared to the regular exhaust.

[macastel1]

Originally Posted by VNGNCE5

Competition doesn't always have the valves open. The competition exhaust has the baffles removed inside the cans. The FULL competition exhaust doesn't have perforation in the resonators (resonator delete) and that's where the majority of the difference in sound comes from compared to the regular exhaust.

Thanks, very stupid question: are the resonators part of the axle back set up?
If they are not, then the only difference in sound is the lack of valves in the CP?

[SLVSRFR]

Originally Posted by macastel1

Thanks, very stupid question: are the resonators part of the axle back set up?
If they are not, then the only difference in sound is the lack of valves in the CP?

No the resonators are not part of the mufflers. The CP mufflers have valves, don't know where you seen that they didn't. They also open and close just like normal mufflers, the only difference is CP mufflers have the internal baffle removed.

[macastel1]

Originally Posted by VNGNCE5

No the resonators are not part of the mufflers. The CP mufflers have valves, don't know where you seen that they didn't. They also open and close just like normal mufflers, the only difference is CP mufflers have the internal baffle removed.

I guess I thought the baffle and valves were the same. Not it makes more sense. Thanks.

do you recommend going with the CP or regular? Or its a matter of personal preference?

[SLVSRFR]

Originally Posted by macastel1

I guess I thought the baffle and valves were the same. Not it makes more sense. Thanks.

do you recommend going with the CP or regular? Or its a matter of personal preference?

You honestly can save a lot of money by deleting the muffler and achieve a similar sound to CP. I have the full CP exhaust on my 550 but ended up selling the mufflers and just deleted the mufflers altogether.

CP mufflers are usually over priced on the market. If you want, you could find a cheap set of regular mufflers and have a shop remove the baffle themselves, it's just insulation.

[macastel1]

Originally Posted by VNGNCE5

You honestly can save a lot of money by deleting the muffler and achieve a similar sound to CP. I have the full CP exhaust on my 550 but ended up selling the mufflers and just deleted the mufflers altogether.

CP mufflers are usually over priced on the market. If you want, you could find a cheap set of regular mufflers and have a shop remove the baffle themselves, it's just insulation.

I think I found a local guy with a full m5 exhaust. I am negotiating just the axle back parts (hopefully he accepts)

So to remove the baffles the shop just opens the "cans" and remove the insulation?

[SLVSRFR]

Originally Posted by macastel1

I think I found a local guy with a full m5 exhaust. I am negotiating just the axle back parts (hopefully he accepts)

So to remove the baffles the shop just opens the "cans" and remove the insulation?

Yeah, if the shop is willing to do it